Question: The relative permeability of materials is not constant:

• 1. diamagnetic
• 2. paramagnetic
• 3. ferromagnetic
• 4. insulating

Question: A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?

• 1. M
• 2. M/2
• 3. 2 M
• 4. M/4

Question: Magnetic moment is a_____________?

• 1. pole strength
• 2. universal constant
• 3. scalar quantity
• 4. vector quantity

Question: Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials:

• 1. circular
• 2. triangular
• 3. rectangular
• 4. none of the above

Question: A keeper is used to_____________?

• 1. change the direction of magnetic lines
• 2. amplify flux
• 3. restore lost flux
• 4. provide a closed path for flux

Question: The uniform magnetic field is______________?

• 1. the field of a set of parallel conductors
• 2. the field of a single conductor
• 3. the field in which all lines of magnetic flux are parallel and equidistant
• 4. none of the above

Question: The change of cross-sectional area of conductor in magnetic field will affect______________?

• 1. reluctance of conductor
• 2. resistance of conductor
• 3. A and B both in the same way
• 4. none of the above

Question: The magneto-motive force is______________?

• 1. the voltage across the two ends of exciting coil
• 2. the flow of an electric current
• 3. the sum of all currents embraced by one line of magnetic field
• 4. the passage of magnetic field through an exciting coil

Question: A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?

• 1. Decreases
• 2. Increases
• 3. Remains same
• 4. First increases and then decreases depending on the depth of iron in¬sertion

Question: What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?

• 1. 2 AT
• 2. 4 AT
• 3. 6 AT
• 4. 10 AT